Interwell exciton relaxation in semimagnetic asymmetric double quantum wells

S. V. Zaitsev, A. S. Brichkin, P. S. Dorozhkin, G. Bacher

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The possibility of magnetic field control of the spectral and polarization characteristics of exciton recombination is examined in Cd(Mg, Mn) Te-based asymmetric double quantum wells. At low fields, the exciton transition in a semimagnetic well is higher in energy than that in a nonmagnetic well and the interwell exciton relaxation is fast. In contrast, when the energy order of the exciton transitions reverses at high fields, unexpectedly slow relaxation of σ- polarized excitons from the nonmagnetic well to the σ+-polarized ground state in the semimagnetic well is observed. Strong dependence of the total circular polarization degree on the heavy-light hole splitting Δ hh-lh in the nonmagnetic well is found and attributed to the spin dependent interwell tunneling controlled by exciton spin relaxation. Such a slowing down of the relaxation allows separation of oppositely spin-polarized excitons in adjacent wells.

Original languageEnglish
Pages (from-to)340-343
Number of pages4
JournalJETP Letters
Volume84
Issue number6
DOIs
Publication statusPublished - Nov 2006
Externally publishedYes

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